| 摘要 |
NEW MATERIAL:A tetrahydrobenzothiazole derivative of formula I (R is methyl, ethyl or propyl; R1 is H, hydroxyl group, methoxyl group, acetoxy, propionyloxy, butyryloxy, chloroacetoxy, methoxyacetoxy, alkylamino substituted by 1- 4C alkyl group or dialkylamino; R2 is H or together with R1 form oxygen atoms of double bond; X is methylene, hydroxymethylene or carbonyl, etc.). EXAMPLE:1-(5, 5-Dimethyl-4, 5, 6,7-tetrahydro-7-oxo-2-benzothiazolyl)-3-ethylimidazolidinetrione. USE:A herbicide exhibiting improved activity against gamineous and broad-leaved weeds, etc. PREPARATION:For example, a compound of formula II is reacted with glyoxal or base oxalyl, etc. to give the aimed compound of formula I .
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